A prenuptial agreement is only valid if it is completed prior to marriage. After a couple is married, they may draw up a post-nuptial agreement. In the United States, prenuptial agreements are recognized in all fifty states and the District of Columbia.
Osmosis - the diffusion of water (across a membrane) Water will move in the direction where there is a high concentration of solute (and hence a lower concentration of water. A simple rule to remember is: Salt is a solute, when it is concentrated inside or outside the cell, it will draw the water in its direction.
Using these words and information we can now summarise osmosis with its definition. Osmosis is the movement of water molecules through a selectively permeable membrane from higher water concentration to a lower water concentration-or-down a concentration gradient. Animal cells are surrounded only by the membrane and may swell up and burst if too much water enters by osmosis.